102 results about "Bismuth nitrate" patented technology

The invention relates to the technical field of sewage treatment, and discloses a photocatalytic material and a preparation method and application thereof.The method comprises the following steps that bismuth nitrate pentahydrate and sodium bromide are added into a mannitol solution according to the molar ratio of 1: 1.5, and ultrasonic dispersion is conducted to form turbid liquid; adding arginine into the turbid liquid, wherein the molar ratio of the arginine to the bismuth nitrate pentahydrate is (0-2.5): 1; adjusting the pH value of the turbid liquid and stirring to obtain a precipitate; the precipitate is filtered, washed and dried, and the photocatalytic material nVBi-(110) BiOBr is obtained.By means of the photocatalytic material, the removal rate of hexavalent chromium in alkaline wastewater with the pH being 7-10 can still exceed 90% within a short time, the photocatalytic material shows excellent stability and reaction activity, the technical problem that hexavalent chromium is difficult to remove efficiently in the alkaline environment is successfully solved, and the photocatalytic material has good application prospects. The method has important environmental application value and popularization potential.

The invention discloses a yeast bionic BiVO4 composite photocatalytic material and a synthesis method and application thereof.The synthesis method comprises the steps that firstly, bismuth nitrate pentahydrate, sodium dodecyl benzene sulfonate, nitric acid, ammonium metavanadate and sodium hydroxide serve as raw materials, yeast is added at the same time, and a yeast / BiVO4 composite photocatalyst is prepared through a hydrothermal reaction; and the photocatalyst is used for photocatalytic degradation of 2, 4-dichlorophenol. A hydrothermal reaction method is used, and the synthesis process is simple; the yeast / BiVO4 composite material is of a spherical structure, and compared with a traditional nano-powder or random-form catalyst, the three-dimensional spherical photocatalyst has the main advantages that the three-dimensional spherical photocatalyst is derived from a unique physical structure and can bring chemical property improvement, so that the efficiency of photocatalytic degradation of 2, 4-dichlorophenol is improved.

The application relates to a preparation method of a composite semiconductor photocatalyst and application thereof, and comprises the following steps: preparing g-C3N4 nanosheets; dispersing the prepared g-C3N4 nanosheets into methanol at a mass fraction of 10% to 70%, then adding 750 mg of trimesic acid and 150 mg of bismuth nitrate, and ultrasonic treating for 10 min to obtain a mixed suspension; transferring the mixed suspension into a microwave reaction kettle for reaction, the reaction temperature is 90 to 130 DEG C, the reaction time is 30 to 60 min, and centrifugal drying is carried out after the reaction is completed; then g-C3N4 / Bi-MOF is obtained through anhydrous methanol washing and freeze drying; a heterostructure is constructed, the energy band structure is changed, the charge transmission resistance is reduced, the photocatalytic activity is improved, the photocatalyst has two different structure and property photocatalytic activity centers, and the photocatalytic activity is changed from the energy band structure and the catalytic activity.

This invention discloses a method for preparing a Bi3O4Br catalyst for the efficient degradation of tetracycline, comprising the following steps: S1, mixing bismuth nitrate and potassium bromide in an aqueous solution at room temperature, stirring, and filtering after the reaction to obtain a precipitate; S2, washing and drying the obtained precipitate to obtain a BiOBr precursor; S3, placing the obtained BiOBr precursor in a sodium hydroxide solution of a certain concentration and reacting at a certain temperature to obtain the Bi3O4Br catalyst. Experimental results show that the Bi3O4Br catalyst has a larger specific surface area and more photocatalytic active sites than pure Bi3O4Br, and has a higher oxygen vacancy (OV) concentration, exhibiting high catalytic activity in the photocatalytic degradation of tetracycline. This photocatalyst has broad practical value and application prospects.

The invention discloses a device and method for synthesizing a fourth-generation refrigerant R1235ze through photocatalysis of VDF, and belongs to the technical field of green chemical engineering. The core of the method is that a g-C3N4 / BiVO4 heterojunction photocatalyst is adopted to catalyze VDF to react with hydrogen chloride to generate R1234ze under the mild condition of 70-90 DEG C under the irradiation of simulated sunlight (AM1.5 G). The catalyst is prepared by taking melamine, bismuth nitrate and ammonium metavanadate as precursors and carrying out hydrothermal reaction and calcination treatment under specific conditions. The matched industrial system realizes the whole process integration from the continuous preparation of the catalyst to the online separation of the product. According to the method, the reaction temperature is successfully reduced to about 80 DEG C from traditional 400 DEG C or above, energy consumption is reduced by about 75%, CO2 emission is reduced by about 60%, meanwhile, the product selectivity is not lower than 93%, the quantum efficiency is not lower than 12%, the purity reaches up to 99.5% or above, and a subversive solution is provided for green and low-cost industrial production of R1234ze.

The application discloses a preparation method of a photocatalyst for CO2 reduction and application thereof. The photocatalyst is prepared through the following steps: first, preparation of the photocatalyst bismuth oxysulfate; second, metal loading modification of the photocatalyst bismuth oxysulfate. Thiocyanic acid and bismuth nitrate are used as raw materials to synthesize the photocatalyst bismuth oxysulfate, and copper chloride or silver nitrate reagent is selected as a material for metal loading modification of the bismuth oxysulfate, and the selected materials are inexpensive and easy to purchase, and the economic cost is low. The photocatalyst prepared by the method has the advantages of high selectivity, can accelerate electron movement under light conditions, promotes CO2 reduction degradation, and has high stability, and is an ideal photocatalyst. Compared with existing photocatalyst materials, the material has high catalytic degradation reducibility and selectivity, high stability, and when used as a CO2 photocatalyst, can efficiently reduce and convert CO2 into multi-carbon products.

The invention discloses a preparation method and application of a ferroelectric enhanced core-shell structure artificial photosynthetic heterojunction catalyst, and belongs to the field of solar energy conversion and photocatalytic degradation. The invention aims to explore the technical problems of low-cost green preparation, high photoelectric conversion efficiency and photocatalytic performance improvement of the photocatalyst. The method comprises the following steps: 1, respectively dissolving bismuth nitrate pentahydrate and iron nitrate nonahydrate in ethylene glycol in sequence, heating in a water bath, stirring, aging, transferring sol into an air dry oven, drying to obtain gel powder, grinding, transferring the powder into a muffle furnace, and calcining to obtain BiFeO3 powder (named as BFO); and 2, dissolving thioacetamide in deionized water, fully stirring, adding the BFO prepared in the step 1, transferring the solution into an ultrasonic cleaning machine, carrying out ultrasonic dispersion, transferring the solution into a reaction kettle, carrying out heating reaction, cooling, washing, and drying to obtain the ferroelectric enhanced Bi2S3 / BFO photocatalyst with a stable heterojunction structure.

The application provides a preparation method of bismuth nanoparticle material and application thereof, and dissolves bismuth nitrate pentahydrate in ethylene glycol to prepare a solution, then adds nitric acid to accurately adjust the pH value of the solution to 1.0; dissolves sodium citrate in ethylene glycol to prepare a solution; mixes the two solutions and uniformly mixes; transfers the mixed solution to a microwave reaction kettle, and under the condition that the temperature is 110-130 DEG C and the microwave power is 300-500 W, radiates and reacts for 20-40 min; cools to room temperature, and the obtained product is washed by centrifugation with ethanol for multiple times, and dried, to obtain black bismuth nanoparticles. The application accurately controls the acidic environment of the precursor solution by nitric acid, and utilizes the synergistic and co-reduction effect of sodium citrate and ethylene glycol to quickly and controllably reduce Bi 3+ to elemental Bi to form nanoparticles. The application has outstanding advantages in efficiency, controllability, environmental protection and cost.

The present application relates to a kind of preparation methods of sulfur vanadium co-doped bismuth tungstate visible light catalyst, the catalyst is assisted by urea hydrothermal method, with sodium tungstate, bismuth nitrate, thiourea, citric acid, ammonium metavanadate, urea as raw material, configuration certain concentration of thiourea and citric acid aqueous solution as sulfur source;Configuration certain concentration of ammonium metavanadate aqueous solution as vanadium source.Sulfur source and vanadium source are mixed after drop by drop to be added to bismuth nitrate solution, after stirring, transfer to hydrothermal kettle, the hydrothermal kettle is placed in blast oven and hydrothermal treatment cooling, centrifugal separation product, washing and drying obtain sulfur vanadium co-doped BWO visible light catalyst.The method is obtained by one-step hydrothermal treatment flower cluster of bismuth tungstate nanosheet composition, simple process, low equipment requirement, the composite photocatalyst prepared has stronger response under visible light condition, has higher application value in pollution control, environmental protection, new energy preparation and other fields.

The invention belongs to the field of magnesium ion battery positive electrode materials, and particularly relates to a preparation method of a magnesium ion battery positive electrode material BixVS4 composite material, which comprises the following steps: dissolving an organic reducing agent in N-methyl pyrrolidone, and stirring at room temperature; adding ammonium metavanadate, and stirring at 50-100 DEG C; adding thioacetamide, and continuously stirring; adding hydrochloric acid and stirring until the color of the solution becomes dark green; and adding bismuth nitrate pentahydrate, stirring, carrying out a hydrothermal reaction in a reaction kettle, cooling to room temperature, centrifuging, washing with deionized water and absolute ethyl alcohol for several times, and drying to obtain the BixVS4 composite material. The method has the advantages that VS4 is subjected to cation modification, high conductivity is provided by introduction of metal ions, and charge transfer is accelerated. Bi enters a VS4 crystal lattice, local charge rearrangement is caused, Van der Waals force between VS4 layers is weakened, rapid embedding and de-embedding of Mg < 2 + > are facilitated, and more active sites for embedding of Mg < 2 + > are provided.

This invention relates to a method for in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste. The technical solution is as follows: vanadium-containing solid waste is ground into powder, and the resulting vanadium-containing solid waste powder is mixed with vanadium pentoxide powder. The resulting vanadium-containing geopolymer precursor is mixed with an alkaline activator and stirred evenly to obtain a vanadium-containing geopolymer slurry. The vanadium-containing geopolymer slurry is placed in a mold, cured, demolded, cured a second time, and crushed to obtain a crushed vanadium-containing geopolymer. The crushed vanadium-containing geopolymer is mixed with deionized water to obtain a vanadium-containing geopolymer aqueous solution. Bismuth nitrate solution is added to the vanadium-containing geopolymer aqueous solution, mixed evenly, and the pH value is adjusted. A hydrothermal reaction is then carried out. Solid-liquid separation, washing, and drying are performed to obtain the visible light photocatalytic geopolymer. This invention can efficiently utilize low-vanadium content and completely eliminate vanadium. The in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste not only effectively decomposes organic pollutants under visible light conditions but also effectively fixes vanadium in the vanadium-containing solid waste.

The application discloses a flower ball-shaped bismuth disulfide / tungsten disulfide composite material and a preparation method and application thereof. Tungsten hexachloride is added into anhydrous ethanol solution and fully stirred, then bismuth nitrate pentahydrate is added into the mixed solution and stirred to uniformly disperse the bismuth nitrate pentahydrate into the solution, then thioacetamide is added and stirred to be uniform, the obtained solution is moved into a reaction kettle, and the reaction kettle is sealed and placed into a homogeneous reactor; after the reaction is completed, the product is taken out, washed and fully dried in a vacuum oven to obtain the composite material. The composite material has a thickness of 20-30 nm, and nanosheets are vertically grown on a self-assembled flower ball-shaped structure with a diameter of 350-400 nm; the composite material can be applied to preparation of a potassium ion battery negative electrode material, and the structure is more stable, the conductivity is better, and the electrochemical performance is greatly improved.

The application discloses a preparation method of a bismuth single element / bismuth oxide / carbon nitride composite material and application of the bismuth single element / bismuth oxide / carbon nitride composite material as a chlorine removal agent, and the bismuth single element / bismuth oxide / carbon nitride composite chlorine removal agent is prepared by taking bismuth nitrate pentahydrate as raw material and introducing melamine precursor. In the process of calcination, the melamine generates elemental carbon and carbon monoxide, and plays a regulating role in the morphology of the chlorine removal agent; the reducing property generated in the forming process can convert Bi 3+ into Bi single element, and the surface plasmon resonance effect of the Bi single element is utilized to improve the photocatalytic chlorine removal performance of the composite chlorine removal agent.

This invention belongs to the field of environmental material preparation technology, and specifically relates to a method for preparing a silver / bismuth oxychloride / bismuth oxide / carbon fiber composite photocatalyst, comprising the following steps: A. Mixing carbon fiber with bismuth nitrate solution to react and obtain bismuth oxide / carbon fiber; B. Reacting the bismuth oxide / carbon fiber obtained in step A with bismuth nitrate solution and hexadecyltrimethylammonium chloride solution to obtain bismuth oxychloride / bismuth oxide / carbon fiber; C. Taking the bismuth oxychloride / bismuth oxide / carbon fiber obtained in step B, carrying out a photoreduction reaction in silver nitrate solution, and obtaining a flexible silver / bismuth oxychloride / bismuth oxide / carbon fiber photocatalyst after washing and drying.

The invention discloses a defect-engineered nanosheet material for an alkaline aqueous battery as well as a preparation method and application of the defect-engineered nanosheet material, and belongs to the technical field of nano materials and electrochemical energy storage. The method comprises the following steps: firstly, dissolving 1, 3, 5-benzene tricarboxylic acid and bismuth nitrate pentahydrate in methanol, and carrying out hydrothermal reaction to obtain a bismuth-based metal-organic framework precursor; and then dispersing the precursor and ammonium halide in deionized water, and carrying out ion etching reaction through oil bath heating to obtain the bismuth oxyhalide nanosheet material. The prepared material has a self-supported hierarchical porous nanosheet structure, the surface of the material has wrinkles and pore channels, and the material contains oxygen vacancies and low-valence bismuth defects. The material can be used as a negative electrode to be applied to an alkaline aqueous battery, and after the material, a positive electrode material and alkaline electrolyte are assembled into a battery, the battery has high specific capacity, excellent rate capability and good cycle stability. The preparation method is simple in process and mild in condition, and the material performance can be optimized by adjusting etching parameters.

The application relates to a preparation method and application of a multilayer shell-shaped bismuth oxide / bismuth / carbon composite material and belongs to the technical field of lithium ion batteries. Bismuth nitrate pentahydrate and ethylene glycol are added into an ethanol solvent and uniformly ultrasonically mixed, then are placed in a solvent thermal reaction at a temperature of 180-200 DEG C for 150-180 min, are cooled to room temperature, are subjected to solid-liquid separation, and the solid is sequentially washed by deionized water and ethanol and is dried to obtain multilayer shell-shaped bismuth oxide; glucose and the multilayer shell-shaped bismuth oxide are added into deionized water and uniformly ultrasonically mixed, then are placed in a hydrothermal reaction at a temperature of 180-200 DEG C for 120-180 min, are subjected to solid-liquid separation, and the solid is sequentially washed by deionized water and ethanol and is dried to obtain a precursor; the precursor is uniformly heated to a temperature of 400-600 DEG C under an argon atmosphere and is calcined at a constant temperature for 1-2 h to obtain the multilayer shell-shaped bismuth oxide / bismuth / carbon composite material. The multilayer shell-shaped bismuth oxide / bismuth / carbon composite material has a high specific surface area, and as a lithium ion battery negative electrode, can relieve the huge volume expansion of a lithium ion battery in a lithiumation process.

The application discloses a preparation method of a photocatalytic material Bi / Bi2MoO6 / BiOBr for indoor formaldehyde degradation, which comprises the following steps: dissolving bismuth nitrate and sodium molybdate in ethylene glycol respectively to prepare bismuth nitrate solution and sodium molybdate solution; adding the sodium molybdate solution into the bismuth nitrate solution drop by drop to prepare a mixed solution, adding ethanol and BiOBr, stirring and ultrasonicating, transferring into a high-pressure reaction kettle, heating to 160 DEG C and keeping for 12 hours, drying the product to obtain Bi2MoO6 / BiOBr; dissolving the Bi2MoO6 / BiOBr in water and ultrasonicating, adding a sodium borohydride solution and stirring, washing with water and centrifuging, and drying the product to obtain Bi / Bi2MoO6 / BiOBr. The application provides a preparation method of the photocatalytic material Bi / Bi2MoO6 / BiOBr, which adopts a simple hydrothermal method and a sodium borohydride reduction method, and the ternary photocatalyst formed has excellent degradation effect on gaseous formaldehyde.

The application belongs to the technical field of medicines, and relates to a ferric bismuth oxide multi-modal imaging probe and a preparation method and application thereof. x The ferric bismuth oxide multi-modal imaging probe has a molecular formula of BiFeO x wherein x is 2.5-3.5, the ferric bismuth oxide multi-modal imaging probe has CT imaging and MRI imaging functions, and has POD-like activity, CAT-like activity and GSH-Px-like activity. The preparation method comprises the following steps: dissolving bismuth nitrate in a mannitol solution, then adding a high-molecular polymer to form an A solution; dissolving ferric nitrate in a mannitol solution to form a B solution; dropping the B solution into the A solution, then adding ammonia water, performing high-temperature treatment after reaction, and obtaining the ferric bismuth oxide multi-modal imaging probe after cooling and washing. The ferric bismuth oxide multi-modal imaging probe has significant advantages in multi-modal imaging and tumor treatment, overcomes part of the limitations of single imaging technology and traditional treatment methods, and has important clinical application value.

The invention relates to the technical field of electrochemical energy storage, and discloses a preparation method of a bismuth carbon nanowire-based planar electrochemical filter capacitor, which comprises the following steps of: (1) adding 2g of polyacrylonitrile and 1g of bismuth nitrate pentahydrate into 20mL of dimethylformamide, and stirring for 12 hours at room temperature in an argon atmosphere to obtain a white transparent viscous spinning precursor solution; (2) filling the spinning precursor solution into an injector with a 20G needle, and taking a roller wrapped by aluminum foil as a receiving device; according to the bismuth carbon nanowire-based planar electrochemical filter capacitor and the preparation method thereof, bismuth nitrate pentahydrate and polyacrylonitrile are co-dissolved in a spinning precursor solution, and after electrostatic spinning and gradient heat treatment, in-situ generation and uniform embedding of bismuth or oxide nanoparticles thereof in a carbon nanofiber matrix are realized; the problems of particle aggregation and weak interface bonding caused by a traditional post-loading method are effectively avoided, and the integrity and cycling stability of the electrode structure are improved.

The application belongs to the field of photocatalytic material preparation, and aims at solving the problem of low photocatalytic efficiency. The preparation method comprises the following steps: firstly, pre-oxidized graphene is put into distilled water and uniformly dispersed by ultrasonic, so as to obtain an oxidized graphene suspension; bismuth nitrate and ammonium metavanadate are respectively dissolved in nitric acid and ammonia water to obtain two solutions A and B; under ultrasonic state, A and B are added into the oxidized graphene suspension and uniformly dispersed, and then a precursor solution is obtained after magnetic stirring; secondly, the precursor solution is loaded into a reaction kettle with a polytetrafluoroethylene lining, and the reaction kettle is kept at 110 DEG C for 24 hours; the reaction liquid is obtained after the temperature is reduced to 60 DEG C; thirdly, the precipitated solid phase material in the lower layer of the reaction liquid is collected, washed, dried and ground into powder, so as to obtain graphene oxide / BiVO4 composite photocatalytic nanoparticles. The preparation method is simple, and the graphene oxide / BiVO4 composite photocatalytic nanoparticles obtained by the method effectively improve the photocatalytic oxidation performance.

The invention belongs to the technical field of air pollution prevention and control of photocatalytic materials, and particularly relates to a nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) respectively dissolving ammonium sulfate, bismuth nitrate and potassium bromide in water, mixing and transferring into polytetrafluoroethylene, and obtaining nitrogen-doped bismuth oxybromide by utilizing a hydrothermal method; 2) adopting a hydrothermal-assisted thermal polymerization method, obtaining a precursor through a melamine hydrothermal reaction, and performing nitrogen calcination to obtain tubular graphite-phase carbon nitride; 3) adding the mixed sample into methanol, and adopting a mechanical stirring method to obtain the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst. Due to the formation of the heterojunction, the activity of the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride in photocatalytic reduction of carbon dioxide can be greatly improved.

The invention discloses a rose spherical bismuthyl carbonate catalyst as well as a preparation method and application thereof, and belongs to the technical field of electro-catalytic materials. The catalyst is rose-ball-shaped Bi2O2CO3, is characterized by being formed by stacking and assembling nanosheets layer by layer, is large in specific surface area and rich in active sites, and has excellent selectivity and stability for preparing formic acid through electrocatalytic reduction of CO. According to the preparation method, a solvothermal method is adopted, bismuth nitrate pentahydrate is taken as a bismuth source, sodium citrate dehydrate and urea are taken as a composite carbon source, ethylene glycol and deionized water are taken as a mixed solvent, and morphology-controllable synthesis is realized by regulating and controlling the reaction temperature and time. According to the catalyst, the formic acid Faraday efficiency reaches 90% or above within the RHE potential range of-0.7 V vs to-1.2 V vs, the highest formic acid Faraday efficiency can reach 96.7%, the hydrogen evolution side reaction can be effectively inhibited, the stable catalytic performance is kept in the 16-hour continuous electrolysis process, and an efficient and feasible technical scheme is provided for COresource utilization.

The invention relates to a carbon nanotube loaded tantalum monatomic doped bismuth sulfide catalyst as well as a preparation method and application thereof, and aims to solve the problems that the yield of H2O2 prepared through electro-catalysis of an existing bismuth-based catalyst is relatively low, and the selectivity of H2O2 is relatively low. The preparation method comprises the following steps: 1, dispersing trimesic acid, tantalum pentachloride and bismuth nitrate pentahydrate in methanol, and carrying out solvothermal reaction at 110-140 DEG C to obtain a tantalum-doped bismuth metal organic framework material; 2, grinding and mixing the tantalum-doped bismuth metal organic framework material and dibenzyl disulfide to obtain a mixture; and 3, in an argon atmosphere, heating to 750-950 DEG C, and carrying out heat preservation carbonization treatment. The bismuth sulfide catalyst prepared by the method shows H2O2 selectivity of more than 90% in a wide voltage range of 0-0.65 V, and the H2O2 yield can reach 8.76 mol.g <-1 >. H <-1 > under the industrial-grade current density of 75 mA / cm < 2 >.

The invention discloses a Fe-doped Bi2SeO5 nano material as well as a preparation method and application of the Fe-doped Bi2SeO5 nano material. The preparation method comprises the following steps: dissolving ferric chloride hexahydrate, bismuth nitrate pentahydrate and sodium selenite according to a specific ratio by using a hydrothermal synthesis technology and taking pure water as a solvent, and stirring at the room temperature of 25 DEG C until a system is uniform, so as to obtain a precursor mixed solution of the Fe-doped Bi2SeO5 nano material; the mixed solution is subjected to a hydrothermal reaction and then is subjected to heat treatment in an air atmosphere, and the target Fe-doped Bi2SeO5 nano material is finally obtained by regulating and controlling parameters such as a precursor ratio, a hydrothermal reaction temperature, heat preservation time and heat treatment conditions through a system. The nano material is used for catalytic degradation of antibiotics in a PMS system, and has the characteristics of strong anti-interference capability, good tolerance to acid and alkali environments, remarkable catalytic effect, high stability and the like.

The invention provides a flexible composite sodium metal negative electrode and a preparation method thereof, a sodium ion battery and electric equipment, and relates to the field of sodium ion batteries. The method comprises the following steps: carrying out acid leaching on a metal framework to obtain a treated framework; carrying out first mixing on the treated framework and first alkali liquor, and electrifying to obtain a framework coated with copper hydroxide; sequentially carrying out annealing treatment and heat treatment on the copper hydroxide coated framework under reducing gas to obtain a copper nanowire coated metal framework; carrying out second mixing and reaction on the copper nanowire coated metal framework, tartaric acid, bismuth nitrate and water, and then cleaning by adopting second alkali liquor and water to obtain a bismuth modified sodium-philic three-dimensional metal framework; and injecting the bismuth-modified sodium-philic three-dimensional metal skeleton into molten sodium metal or electrochemically depositing the sodium metal to obtain the flexible composite sodium metal negative electrode. The method has the advantages of being wide in raw material source, simple to operate, good in repeatability, low in cost, beneficial to large-scale production and the like, and has the possibility of practical application.

The application discloses a preparation method and application of Yb and Er co-doped S-type heterojunction, and the Yb and Er co-doped S-type heterojunction is synthesized by using indium nitrate, silver nitrate and thioacetamide as raw materials, through a hydrothermal method, AgIn5S8 is synthesized by etching Ti3AlC2 through HF, Ti3C2T x MXene. Bismuth nitrate and potassium chloride are used as raw materials, a certain amount of ytterbium nitrate, erbium nitrate, AgIn5S8 and MXene are added, then a Yb and Er co-doped BiOCl / MXene / AgIn5S8 composite material is synthesized through an in-situ hydrothermal growth method, and the catalyst is applied to degradation of wastewater containing tetracycline hydrochloride, can realize effective degradation of antibiotic wastewater under visible light and near-infrared light respectively. Meanwhile, the catalyst has full-spectrum response performance, can fully utilize clean energy solar energy, and realizes efficient purification of water pollutants.

The application discloses a preparation method of nano-bismuth vanadate with different morphologies and application thereof. The method specifically comprises the following steps: adding an ammonium metavanadate aqueous solution into a bismuth nitrate aqueous solution, and then performing a reaction under the condition that the pH value is 5-10, so that the nano-bismuth vanadate with different morphologies is prepared. The pH value of the reaction system is simply and effectively adjusted by using sodium hydroxide lye, and other organic reagents are not needed to be added, so that the nano-bismuth vanadate obtained not only has controllable appearance and large specific surface area, but also has peroxidase-like activity, and can be used for detecting melamine in a solution.

The invention discloses a mechanochemical synthesis method of a bismuth-based metal organic framework (Bi-MOF) and application of the Bi-MOF. The method comprises the following steps: mixing bismuth nitrate pentahydrate and trimesic acid according to a mass ratio of (1: 0.3)-(1: 5), adding a grinding medium and a liquid-phase auxiliary agent, and carrying out ball-milling reaction at room temperature; the ball milling rotating speed is 230-580 revolutions per minute, and the ball milling time is 8-72 hours; and after the reaction is finished, separating, washing and drying to obtain the Bi-MOF material. The invention further provides the Bi-MOF material prepared by the method, a bismuth / carbon composite material obtained by pyrolysis of the Bi-MOF material, and an application of the Bi-MOF material in a sodium ion battery negative electrode. The mechanochemical method is successfully applied to green synthesis of Bi-MOF for the first time, the process is simple, the condition is mild, a large amount of solvent is not needed, large-scale production is easy, and the defects that a traditional solvothermal method is high in energy consumption, high in pollution and low in yield are overcome. The obtained Bi-MOF is good in crystallinity, and the bismuth / carbon composite material derived from the Bi-MOF shows high specific capacity and excellent rate capability in a sodium-ion battery negative electrode and has good application prospects.

The disclosure provides a composite photocatalytic material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, respectively dissolving bismuth nitrate and a phosphate into water to obtain a bismuth nitrate solution and a phosphate solution, adding the phosphate solution into the bismuth nitrate solution for first mixing to obtain a suspension containing a BiPO4 precursor; S2, adding melamine into the suspension containing the BiPO4 precursor for second mixing and heating treatment to obtain a first mixed material; S3, centrifugally separating the first mixed material to obtain a solid powder; and calcining the solid powder. The composite photocatalytic material prepared by the method of the disclosure has a good degradation effect on refractory organic dyes.